Greenbriar, Virginia has a Humid Subtropical Climate climate (Köppen classification: Cfa). Average annual temperatures range from 45.4 °F (low) to 65.8 °F (high). Annual precipitation averages 43.9 Inches. Greenbriar is located in USDA Plant Hardiness Zone 7b. The growing season typically runs from the last frost around Apr. 21 - Apr. 30 through the first frost around Oct. 11 - Oct. 20.
| Month | Avg. Low | Avg. High | Avg. Precip |
|---|---|---|---|
| January | 24.9 °F | 42.9 °F | 2.94 in. |
| February | 26.3 °F | 46.1 °F | 2.61 in. |
| March | 33.2 °F | 54.6 °F | 3.69 in. |
| April | 43.3 °F | 66.3 °F | 3.26 in. |
| May | 53.2 °F | 74.3 °F | 4.41 in. |
| June | 62.1 °F | 82.8 °F | 4.44 in. |
| July | 66.9 °F | 87.3 °F | 4.41 in. |
| August | 65.2 °F | 85.6 °F | 3.51 in. |
| September | 58.4 °F | 79.1 °F | 4.21 in. |
| October | 46.1 °F | 67.5 °F | 3.71 in. |
| November | 35.7 °F | 56.7 °F | 3.14 in. |
| December | 29.0 °F | 46.7 °F | 3.58 in. |
| Annual | 45.4 °F | 65.8 °F | 43.91 in. |
| Average First Frost Date | Oct. 11 - Oct. 20 |
| Average Last Frost Date | Apr. 21 - Apr. 30 |
| Average Days With Frost | 100-125 Days |
| Plant Hardiness Zone | Zone 7b : 5°F to 10°F |
| Plant Hardiness Zone - 2012 | Zone 7a : 0°F to 5°F |
| Current Drought Conditions | Moderate Drought |
| Köppen Climate Classification | Cfa - Humid Subtropical Climate |